Spade38 is correct, these are not the 7.1 Model Revolver S and do not come with surround sound. They are the stereo model, still a great headset and great price though! You can also upgrade them to the surround sound by buying the USB with 7.1 separate on the HyperX Site ($29.99).
https://www.hyperxgaming.com/us/headsets/accessories